Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a62c939d0a4eab…

MALICIOUS

PDF

39.1 KB Created: 2020-09-13 05:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2fc42ee5d26e61a95ce10fc65dd604a0 SHA-1: 5c92a80cefda11f304e74bf0905dd88da557c397 SHA-256: d2a62c939d0a4eab4467850a26342a0dc92a6e8bf38e735e1bec21a1a0ac880a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, 'https://ttraff.club/pify?keyword=stick+dude+killing+arena+game', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting a link farm designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.club/pify?keyword=stick+dude+killing+arena+game In PDF document text
    • http://files.barbaragraystudio.com/uploads/1/3/1/4/131407227/fakemupufanazo_vedatokuki.pdfIn PDF document text
    • http://files.framedbytheword.com/uploads/1/3/1/6/131636737/dezosiku.pdfIn PDF document text
    • http://files.crustysfeed.com/uploads/1/3/1/6/131637020/tususowaroxolux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0462/4374/1845/files/abnormal_psychology_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3172/4183/files/13976015637.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1537/9880/files/bozati.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8bc2a6_567451878b2e4d8db4f8457e542a948b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/45e30f_8cf789e5d9da40309701a0d2e9db5761.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d7ba0f_4ba3443091c14b00b40bd16ebd2cb2c8.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0756/5209/files/comptia_a_1001_and_1002_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0299/2536/files/creative_curriculum_vitae_template_free_word.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F49 5020 bytes
SHA-256: 052628455eae58d1dd4bb6ccd7c8cc1769a6d09636c7cf1ccb471f38a3c413da
font_01_sfnt_off00006036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6036 9904 bytes
SHA-256: 7004a1bbe48514814f3e5530a4832acd1207770249a9395edbf9a29a85f6c98c
font_02_sfnt_off00008205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8205 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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